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Stock Option Plan and Stock Based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 01, 2017
May 31, 2017
May 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Number of Shares, Options Outstanding, Beginning Balance 172,496 172,496  
Number of Shares, Granted   0 0
Number of Shares, Terminated   0  
Number of Shares, Exercised   0  
Number of Shares, Options Outstanding, Ending Balance   172,496  
Weighted Average Exercise Price, Beginning Balance $ 15.95 $ 15.95  
Weighted Average Exercise Price, Granted   0  
Weighted Average Exercise Price, Terminated   0  
Weighted Average Exercise Price, Exercised   0  
Weighted Average Exercise Price, Ending Balance   $ 15.95  
Weighted Average Remaining Contractual Life, Ending Balance 4 years 2 months 12 days 4 years  
Aggregate Intrinsic Value $ 223 $ 200  
Number of Shares, Exercisable   170,880  
Weighted Average Exercise Price, Exercisable   $ 15.97  
Weighted Average Remaining Contractual Life, Exercisable   3 years 10 months 25 days  
Aggregate Intrinsic Value, Exercisable   $ 196